Viewing archive of Thursday, 31 December 2020

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2020 Dec 31 1231 UTC

SIDC Forecast

Solar flares

Quiet conditions (<50% probability of C-class flares)

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
31 Dec 2020	082	003
01 Jan 2021	081	003
02 Jan 2021	080	004

Bulletin

Solar activity was at very low levels over the past 24 hours. No significant flares have been recorded. NOAA Active Region 2795 (beta) showed signs of decay while NOAA AR2794 (alpha) remained stable. Solar activity is expected to remain at low levels, with a low probability of C-class flares.

No Earth directed Coronal Mass Ejections (CMEs) have been detected in the available coronagraphic imagery.

The greater than 10 MeV proton flux was at nominal levels over the past 24 hours and is expected to remain so for the next 24 hours. The greater than 2 MeV electron flux was slightly enhanced but remained below the 1000 pfu alert threshold. The electron flux is expected to decrease to nominal values over the next 24 hours. The 24h electron fluence was at nominal levels and is expected to remain so over the next 24 hours.

Over the past 24 hours, the solar wind speed decreased from 530 to 400 km/s (DSCOVR and ACE). The total magnetic field strength ranged between 0 and 5 nT. Bz had a minimum value of -4 nT. The interplanetary magnetic field was predominantly directed towards the Sun (phi angle in the negative sector). Over the next 24 hours, the solar wind parameters are expected to continue to decrease and then to be at nominal levels for the next two days.

Geomagnetic conditions were at quiet to unsettled levels over the past 24 hours (NOAA Kp and local k Dourbes recorded values of 1-3 and 0-3, respectively). Geomagnetic conditions are expected to be at quiet levels for the next 48 hours.

Today's estimated international sunspot number (ISN): 028, based on 14 stations.

Solar indices for 30 Dec 2020

Wolf number Catania	///
10cm solar flux	083
AK Chambon La Forêt	013
AK Wingst	010
Estimated Ap	009
Estimated international sunspot number	027 - Based on 26 stations

Noticeable events summary

Provided by the Solar Influences Data analysis Center© - SIDC - Processed by SpaceWeatherLive

All times in UTC

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